I highly recommend CMG Infinity Ultra.They are about as bright as a Photon 2 and water proof to thirty feet.The really nice thing is that they take one AA battery.CMG claims the Ultra will run for 25 hours on one AA battery.I own a CMG Task light and an Ultra and they are still on the same batteries when I first got them.The task light is a red L.E.D. and I have had it 2+ years.These are good products.I hope this helps.
BOATMAN